CEL code 14, TPS

[talonDSMerr]

My ecu is throwing code 14, and my car is idle surging. Something is wrong with my TPS, so how can I go about fixing it? Do I need to buy a new one? I read on here that TPS's on our cars need to be electronically configured manually, meaning I should take it to a dealership.. And does a bad/unadjusted TPS cause stuttering/fuel cut?

Thanks for any input.

 

[steve]

First thing you do is check the TPS.

Do you have a SAFC or logger? You can read the TPS voltage on the SAFC from the sensors page and most dataloggers will report actual measured TPS voltage as well as percentages.

To test the TPS without either, disconnect the TPS and measure the resistance of the ground pin on the harness connector to chassis ground. The turn on the ignition on and measure the voltage at the harness connector pin 1 to check for +5v for the sensor power.

Once you sure the ground and +5 are present to the TPS, you can check the TPS resistance and make sure that it transitions smoothly across the range as you move it my measuring between pin 4 or 1 and 2.

On your 1G, the TPS output at idle should be about 0.5v or 10% on the datalogger. You loosen the two bolts and rotate the TPS until you get that reading.

 

[talonDSMerr]

I shouldn't have to remove the TPS from the throttlebody should I? Just disconnect the harness? If any of the readings are off, does that mean I have to purchase a new one?

 

[steve]

No you don't have to take the TPS off unless it needs to be replaced.
To perform the tests you need to take the harness off, while should mean you need to release the clip.
Only the tests where you measure the resistance of the TPS would point to replacing the TPS if it's bad. The first set of tests are to make sure you don't have a wiring harness issue.

 

[talonDSMerr]

On the harness side, I got the 5V from pin 1.
On the sensor side, I got 4.02K ohms between pin 1 and pin 4.
But I couldn't get any reading between pin 4 or 1 and 2, even moving the throttle plate open and closed. I was using the ohmmeter for this, am I doing it right?

 

[steve]

Sounds like you were doing it right. No resistance between 2 and 4 or 1 would mean no output from the TPS to the ECU and that would cause a CEL 14. Try another TPS.

 

[talonDSMerr]

alright, thank you sir.
is it possible to remove the tps without removing the entire throttle body?

 

[Kng Nothg]

Any updates?

Having the same issue.

 

[steve]

Any updates?

Having the same issue.

If your having the same issue then why don't you try the same things we have been telling the OP and get back to us.

 

[Project2G]

Steve. Quick question. If my Safc2 always reads the Throttle at 100% is my TPS faulty?

 

[steve]

Steve. Quick question. If my Safc2 always reads the Throttle at 100% is my TPS faulty?

Not enough information to say.
Use the sensor check screen to display the actual voltage from the TPS.
You could have wiring issues that might look like TPS issues which is why you need to measure the resistances between the pins to rule out or point at the TPS.

 

[Kng Nothg]

If your having the same issue then why don't you try the same things we have been telling the OP and get back to us.

Steve, i stumbled onto this thread late last night. Although it only took a second to ask for an update, i do plan on doing as what you told OP to do...

 

[Kng Nothg]

Steve,

On the harness side, I got the 4.98V from pin 1.
On the sensor side, I got 5.04~K ohms between pin 1 and pin 4.
On the sensor side, I got .08K ohms between pin 2 and 4

Connected to pins 2 & 4 closed throttle is at .08k ohm and wide open is at 4.85 K ohm

By what is listed above as well as vfaq, the sensor is working ok.
Only thing left is to swap an ECU?!?!

EDIT: Using a Matco MD118 (Heavy Duty Logic Probe)
Pin 1 glows Red
Pin 2 glows Green
Pin 4 glows Green

Red -shows voltage
Green -shows proper ground

 

[steve]

The TPS sounds pretty good assuming that the resistance changes smoothly as you move it.

What was the exact symptom/problem. The 1G and 2G are different enough that there can be different causes.

 

[Kng Nothg]

The TPS sounds pretty good assuming that the resistance changes smoothly as you move it.

What was the exact symptom/problem. The 1G and 2G are different enough that there can be different causes.

It does go up smoothly.

The problem is that the car idles high. about 1500-1300. I"ll have to take a video tomorrow so you can get an understanding of what its doing.

There is no idle surge. Going to swap the ECU... (to one that has been repaired and socketed.)

Appreciate the help

 

[steve]

So is/was it throwing a 14 CEL?

Have you checked the ground for the Throttle Body and the IPS?
What's the TPS voltage with the throttle closed?

 

[Kng Nothg]

So is/was it throwing a 14 CEL?

Have you checked the ground for the Throttle Body and the IPS?
What's the TPS voltage with the throttle closed?

Sorta... and here is why..

I replaced the Coolant Tempture sensor and now that code is gone.

I took a few mmcd logs so if u want them, let me know.

Here is the sorta part.

With the car idling it will throw the CEL... i verified that it was a code 14...and is active.
If i touch the gas, the CEL goes away.... i recheck the trouble codes, and there are none!

The ground for the TB and IPS are good. I plan on making new connectors for them though.

Appreciate your help.

 

[rEclipserGST]

My check sensor screen says:

5.10 something for the first
.110 for the second check one.
and 5.10 something for the 3rd.

Bad? I just got a number for a mechanic last night from a local decked out Eclipse that I followed home

I stalk hard if it means my car will work. TPS is owning me.

Here's my other thread for reference: http://www.dsmtuners.com/forums/problem-diagnosis/255885-bad-tps-again.html

Not trying to hi-jack, just trying to help.

 

[steve]

Here is the sorta part.

With the car idling it will throw the CEL... i verified that it was a code 14...and is active.
If i touch the gas, the CEL goes away.... i recheck the trouble codes, and there are none!

It sounds like you haven't set the TPS adjustment at closed throttle. If you just put it on or tried to set it using the VFAQ the output voltage at idle could be too low which will cause a CEL. So will too high a voltage. Look at your MMCd log and see what the TPS reading is at idle.

 

[kamronman]

I have the exact same problem! TPS code on the logger, and it says there's 5% at idle. I'm going to rotate it tomorrow while watching the logger to target 10%! Then re-adjust my idle using the BISS. I was almost going to resort to replacing EVERYTHING on the throttle body..